Question

1. choose all that apply.

what are two of the functions of proteins for organisms?
□ found in hair, muscle, and support structures in organisms
□ protect organs
□ the cell’s preferred way to get energy
□ make up some hormones

1. choose all that apply.

what are three functions proteins perform in cells?
□ cleaning up waste
□ useful energy for all parts of cell membrane
□ cell shape
□ making substances

1. choose the best answer.

amino acids are bonded together by _____ bonds.

• peptide

Explanation:

Sub - Question 1

• For the option "found in hair, muscle, and support structures in organisms": Proteins like keratin (in hair) and actin/myosin (in muscle) are structural proteins, so this is a function of proteins.
• For the option "protect organs": For example, proteins in connective tissues can protect organs, so this is a function.
• For the option "the cell’s preferred way to get energy": The cell's preferred energy source is usually glucose (carbohydrate), not proteins, so this is incorrect.
• For the option "make up some hormones": Hormones like insulin are proteins, so this is a function.

We need to choose two. Let's pick "found in hair, muscle, and support structures in organisms" and "make up some hormones" (or other valid pairs like "found in hair, muscle, and support structures in organisms" and "protect organs", or "protect organs" and "make up some hormones").

• For the option "cleaning up waste": Enzymes (proteins) can help in breaking down waste, so this is a function.
• For the option "useful energy for all parts of cell membrane": Proteins are not the main energy source for the cell membrane (carbohydrates or lipids are more related to energy for membranes in some cases, and proteins have other functions), so this is incorrect.
• For the option "cell shape": Structural proteins help maintain cell shape, so this is a function.
• For the option "making substances": Enzymes (proteins) are involved in synthesis reactions (making substances), so this is a function.

We need to choose three, so the correct options are "cleaning up waste", "cell shape", and "making substances".

Amino acids are linked together by peptide bonds to form polypeptides (which then fold into proteins). This is a basic concept in biochemistry related to protein structure.

Answer:

A. found in hair, muscle, and support structures in organisms, D. make up some hormones (or other valid combinations like A and B, B and D)

Sub - Question 2